Note: iDefrag 5 is a paid upgrade from previous versions. License owners can upgrade for $19.95. Note: Now requires OS X 10.10 or later running on a 64-bit Intel processor.

Fully OS X 10.10 Yosemite compatible version.

New Yosemite-style UI.

New "Selected Files" algorithm.

New, rewritten documentation.

Better handling of bad blocks.

Improved support for Retina displays.

Simpler, easier-to-understand statistics.

After updating to Mavericks, my iMac was running nice and fast. But now two months later, it was nothing but pinning beach balls, a unresponsive Finder which took minutes to draw in a window, and a bunch of other issues.

So I decided to wipe my drive and do a clean install of Mavericks, and then restore everything else from my backup.

That helped a lot, but still, it wasn't running like it should be. So I booted from a maintenance partition, and checked it out with iDefrag. Even though I had just installed everything, it was pretty fragmented. So I ran it over night and now it's as good as new, with Finder windows snapping open and their contents drawing in almost instantly. Applications launch much faster now too.

Years after purchasing this software and several upgrades, the developer accused me of piracy and removed my use of this product. I will never support this company or its products ever again.